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Meaning of polyphasic

pol•y•pha•sic

Pronunciation: (pol"ē-fā'zik), [key]
— adj.
  1. having more than two phases.
  2. habitually doing more than one thing at a time: a polyphasic personality.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.